/**
 * Copyright (c) 2006 George Malamidis, nutrun.com
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this
 * software and associated documentation files (the "Software"), to deal in the Software
 * without restriction, including without limitation the rights to use, copy, modify,
 * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies
 * or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/**
 * $Author$
 * $Rev$
 */

package aerie.context;

import groovy.lang.GroovyClassLoader;

import java.io.File;
import java.io.IOException;

public class CachedAerieContext {
    private AerieContext aerieContext;
    private File file;
    private static long lastModifiedTime;

    public CachedAerieContext(AerieContext aerieContext, File file) {
        this.aerieContext = aerieContext;
        this.file = file;
        lastModifiedTime = file.lastModified();
    }

    public AerieContext getAerieContext() {
        try {
            if (hasBeenModified()) {
                final GroovyClassLoader groovyClassLoader = new GroovyClassLoader(getClass().getClassLoader());
                aerieContext = (AerieContext) groovyClassLoader.parseClass(file).newInstance();
                lastModifiedTime = file.lastModified();
            }
            return aerieContext;
        } catch (InstantiationException e) {
            throw new RuntimeException("Unable to instantiate Context [" + file.getName() + "]", e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e.getMessage(), e);
        } catch (IOException e) {
            throw new RuntimeException("Context [" + file.getName() + "] not found", e);
        }
    }

    private boolean hasBeenModified() {
        return (lastModifiedTime != file.lastModified());
    }
}
